mercurial/win32.py

--- a/mercurial/win32.py	Tue Jul 03 12:10:22 2018 -0400
+++ b/mercurial/win32.py	Wed Jul 04 14:19:13 2018 +0200
@@ -44,6 +44,7 @@
 _ERROR_INVALID_PARAMETER = 87
 _ERROR_BROKEN_PIPE = 109
 _ERROR_INSUFFICIENT_BUFFER = 122
+_ERROR_NO_DATA = 232
 
 # WPARAM is defined as UINT_PTR (unsigned type)
 # LPARAM is defined as LONG_PTR (signed type)
@@ -406,6 +407,12 @@
 
     return avail.value
 
+def lasterrorwaspipeerror(err):
+    if err.errno != errno.EINVAL:
+        return False
+    err = _kernel32.GetLastError()
+    return err == _ERROR_BROKEN_PIPE or err == _ERROR_NO_DATA
+
 def testpid(pid):
     '''return True if pid is still running or unable to
     determine, False otherwise'''